Organisms Consisting of One Cell 



251 



out various inferences concerning certain important aspects of 

 development, even though the observations were mostly limited 

 to the completed organs. To these latter we shall return in 

 the chapter on development and heredity. 



ISO far our glance at the complication of structure occur- 

 ig among the protozoa has been directed chiefly to the 

 organs of contact with the outside world. These organs are 

 particularly characteristic of the large species, and in gen- 

 eral of those leading the freest, most active lives. From the 

 relative conspicuousness of these organs and the ease with 



t UK ?. i in rmm v i.EPToroHinis (AFTER MOCULLOCII). 

 ax., axostvle. has.gr., basal granule, chr.gr., ehromatin granule, 

 fl., flagelluiu. n., nuclriis. Hi., rhi/.oplast. uiid.tu., undulating mem- 

 brane, vac., vacnolc-likr area about the "kinetniuicleus." kn., kine- 

 tonucleus. 



